/*
 * Copyright 2009 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.gtugs.web;

import org.gtugs.domain.Chapter;
import org.gtugs.domain.Event;
import org.gtugs.service.ChapterManager;
import org.gtugs.service.EventManager;
import org.springframework.web.servlet.mvc.Controller;
import org.springframework.web.servlet.ModelAndView;

import java.io.IOException;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * @author jasonacooper@google.com (Jason Cooper)
 */
public class ChapterController implements Controller {

  private ChapterManager chapterManager;
  private EventManager eventManager;

  public ModelAndView handleRequest(HttpServletRequest request,
      HttpServletResponse response) throws ServletException, IOException {
    String id = request.getParameter("id");
    Chapter chapter = retrieveChapter(id);

    if (chapter == null) {
      String errorText = "Failed to retrieve chapter with ID \"" + id + 
          "\" -- chapter not found.";

      return new ModelAndView("error", "errorText", errorText);
    }

    chapter.setNumEvents(0);

    List<Event> pastEvents = eventManager.getPastEvents(chapter.getId());
    if (pastEvents != null) {
      chapter.setNumEvents(pastEvents.size());

      int totalAttendees = 0;
      int totalEvents = 0;
      for (Event event : pastEvents) {
        if (event.getAttendeeCount() != null) {
          totalAttendees += event.getAttendeeCount();
          totalEvents++;
        }
      }

      if (totalEvents > 0) {
        chapter.setAverageAttendees(totalAttendees/totalEvents);
      }
    }

    Map<String, Object> model = new HashMap<String, Object>();
    model.put("chapter", chapter);
    model.put("events", eventManager.getEventsForChapter(chapter.getId(), true));
    model.put("pastevents", pastEvents);

    return new ModelAndView("chapter", "model", model);
  }

  public void setChapterManager(ChapterManager chapterManager) {
    this.chapterManager = chapterManager;
  }

  public void setEventManager(EventManager eventManager) {
    this.eventManager = eventManager;
  }

  private Chapter retrieveChapter(String idString) {
    Long id = null;

    try {
      id = Long.parseLong(idString);
    } catch (NumberFormatException ex) {
      return null;
    }

    return retrieveChapter(id);
  }

  private Chapter retrieveChapter(Long id) {
    return chapterManager.getChapter(id);
  }
}
